Improved optical orthogonal frequency-division multiplexing performance using non-linear signal compression in intensity modulation and direct detection transmission systems incorporating parameter-relaxed digital-to-analogue converters/analogue-to-digital converters

2013 ◽  
Vol 7 (2) ◽  
pp. 51-56 ◽  
Author(s):  
Xing Zheng ◽  
Jianming Tang
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Direct Detection ◽  
Intensity Modulation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Signal Compression ◽  
Transmission Systems ◽  
Non Linear ◽  
Linear Signal ◽  
Analogue To Digital

BER Performance Comparison of DCO-OFDM and Convolutional Coded DCO-OFDM in IM/DD Systems

2019 ◽  
Vol 8 (2) ◽  
pp. 26-39
Author(s):  
Jayasudha Koti ◽  
Braj Kishore Mishra
Keyword(s):  
Channel Coding ◽  
Orthogonal Frequency Division Multiplexing ◽  
Direct Detection ◽  
Additive White Gaussian Noise ◽  
Performance Comparison ◽  
Intensity Modulation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Viterbi Decoder ◽  
Modulation Techniques

Optical wireless communication (OWC) is an alternative technology to meet the demands of the exponentially-growing high data rate applications run by broadband users. The implementation of single carrier modulation techniques in OWC is an age old technology, but for the last few years research is focused towards the multicarrier modulation techniques in OWC. In OWC, information is carried using intensity modulation and retrieved using direct detection. To perform intensity modulation, the baseband signal should be a unipolar signal. To obtain a unipolar signal, various techniques such as DC-biased orthogonal frequency division multiplexing (DCO-OFDM), Asymmetrically clipped orthogonal frequency division multiplexing (ACO-OFDM), Flip orthogonal frequency division multiplexing (Flip-OFDM) and Unipolar orthogonal frequency division multiplexing (U-OFDM) techniques are reported in the literature. Though the DCO-OFDM is spectrally efficient compared to other techniques it requires more power to achieve the targeted BER. In this article, a convolutional Coded DCO-OFDM (CDCO-OFDM) has been introduced by applying channel coding. A convolutional encoder and a hard-decision Viterbi decoder are considered in CDCO-OFDM. It has been observed that CDCO-OFDM requires less transmitted power than DCO-OFDM to attain the targeted BER. The performance of DCO-OFDM and CDCO-OFDM is evaluated for 4, 16, 64 QAM- 7dB and 13dB bias, in the presence of the additive white Gaussian noise (AWGN) channel. It is observed that CDCO requires less power to transmit than DCO-OFDM for the BER 10-4.

Modeling and spectral analysis of high speed optical fiber communication with orthogonal frequency division multiplexing

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Demissie Jobir Galmecha ◽  
Bekele Tesema Hora ◽  
Ram Sewak Singh
Keyword(s):  
Optical Fiber ◽  
Optical Communication ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Direct Detection ◽  
Coherent Detection ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Transmission Systems ◽  
Data Rates

Abstract Optical communication has emerged as the best solution to high-speed transmission systems due to its higher bandwidth and higher data rates. The higher data rates with simple transmitter and receiver modeling are one of the best solutions to design the spectrally efficient high-speed optical transmission system using different modulation techniques. In the recent past, optical communication networks have been specifically designed and optimized to support different communication standards increasing the capabilities of optic fiber, integrated waveguides, and related optical fiber hardware, and signal conditioning circuits. So, this research paper presents a study, modeling, simulation, and analysis of optical performance under different transmission systems which are considered in a practical high-speed design using orthogonal frequency division multiplexing (OFDM). This can be done by using both coherent detection OFDM and direct detection OFDM to minimize dispersion effects in optical communication because OFDM is basic for modern technology to increase the data rate and increase the requirement of bandwidth in broadband services. Many optical fiber problems, such as chromatic dispersion (CD) and polarization mode dispersion (PMD) are solved using OFDM. The performance analyses made in this work by using different parameters such as bit error rate (BER), optical signal-to-noise ratio (OSNR), quality (Q) factor at different distance transmission by using different quadrature modulation such as 4-QAM, 16-QAM, 32-QAM, and 64-QAM to maintain the OSNR value, spectral efficiency, and the required data rates. The simulated results have shown that the coherent detection OFDM and direct detection OFDM with considered QAM provides the best value of BER and quality of the signal at a specific distance.

scholarly journals Reduction of Phase-Modulation to Intensity-Modulation Conversion Noise Effect Using Delayed Self-Homodyne Optical Orthogonal Frequency Division Multiplexing System

2021 ◽  
Vol 13 (1) ◽  
pp. 1-17
Author(s):  
Younus Nidham Ali Mandalawi ◽  
Syamsuri Yaakob ◽  
Wan Azizun Wan Adnan ◽  
Raja Syamsul Azmir Raja Abdullah ◽  
Mohd Hanif Yaacob ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Intensity Modulation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Noise Effect
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